Alaska earthquakes

M5.0 earthquake 52 km SSW of Ugashik, Alaska

A magnitude 5.0 earthquake struck 52 km SSW of Ugashik, Alaska on Sat, Nov 12, 2016, 12:52 PM AKST (21:52 UTC), 10 km (6 mi) below the surface.

Naknek forecast More in Alaska

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude: 5.0 (Mw, moment), moderate
Magnitude from: Alaska Earthquake Center
Local time: Sat, Nov 12, 2016, 12:52 PM AKST
UTC: 2016-11-12 21:52:36 UTC
Depth: 10.3 km (6.4 mi), shallow
Epicenter: 57.069° N, 157.662° W
Region: Alaska
Felt reports: 1
Strongest shaking: VI, strong shaking
PAGER alert: Green
Tsunami flag: Yes: a large quake in an oceanic region
Status: Reviewed by a seismologist

Magnitude estimates

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
5.0	Mw, moment	Alaska Earthquake Center	Preferred · Preliminary
4.9	Mww, W-phase moment	USGS National Earthquake Information Center	Reviewed
5.0	ML, local (Richter)	NOAA National Tsunami Warning Center	Reviewed · 23 stations
5.0	Mw, moment	ISC-GEM global catalog	Final · ±0.1
4.9	Mwr, regional moment	USGS National Earthquake Information Center	Moment tensor · Reviewed

What happened

The USGS’s account of the effects of this earthquake.

Felt at Dillingham and Pilot Point.

From the USGS event page for ak016ekm6cbb. U.S. Geological Survey text and figures are in the public domain.

Tsunami

The USGS flags a quake this large in an oceanic region. The flag does not mean a tsunami happened; the tsunami warning centers decide that, and their messages are below when they issued any.

Current tsunami warnings: tsunami.gov. Warnings in force in the US also appear on our alerts pages.

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: VI, strong shaking
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Estimated impact

The USGS PAGER system estimates deaths and economic losses from the shaking and the population and buildings exposed to it.

Alert level: Green: little or no damage or loss of life expected

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Reverse (thrust)
Moment magnitude: 4.9 Mww
Nodal plane 1: Strike 73°, dip 52°, rake 97°
Nodal plane 2: Strike 242°, dip 38°, rake 81°

How well it is located

Reviewed by a seismologist.

Stations used: 126

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Naknek, AlaskaPopulation 544. Forecast188 kmSSW

Nearby

Within 100 km, magnitude 2.0 and up: 50 in the 60 days after this one and 18 in the 30 days before it.

After

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak016ekm6cbb (also filed as ak14320353, at00ogju3o, us1000775r, iscgem615032914). Read Sat, Oct 3, 2026, 3:14 PM UTC.